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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> * contributor license agreements.  See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> * the License.  You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *     <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  <strong class="jxr_keyword">package</strong> org.apache.commons.configuration;
<a class="jxr_linenumber" name="18" href="#18">18</a>  
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> java.io.ByteArrayOutputStream;
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> java.io.PrintStream;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.util.Collection;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.util.HashMap;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.util.Iterator;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a class="jxr_linenumber" name="28" href="#28">28</a>  
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.event.ConfigurationEvent;
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.event.ConfigurationListener;
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.ConfigurationNode;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.DefaultConfigurationKey;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.DefaultConfigurationNode;
<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.DefaultExpressionEngine;
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.ExpressionEngine;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.NodeCombiner;
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.TreeUtils;
<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.UnionCombiner;
<a class="jxr_linenumber" name="39" href="#39">39</a>  <strong class="jxr_keyword">import</strong> org.apache.commons.configuration.tree.ViewNode;
<a class="jxr_linenumber" name="40" href="#40">40</a>  
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> * A hierarchical composite configuration class.</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> * This class maintains a list of configuration objects, which can be added</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> * using the divers {@code addConfiguration()} methods. After that the</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * configurations can be accessed either by name (if one was provided when the</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * configuration was added) or by index. For the whole set of managed</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> * configurations a logical node structure is constructed. For this purpose a</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * {@link org.apache.commons.configuration.tree.NodeCombiner NodeCombiner}</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * object can be set. This makes it possible to specify different algorithms for</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> * the combination process.</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> * The big advantage of this class is that it creates a truly hierarchical</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> * structure of all the properties stored in the contained configurations - even</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> * if some of them are no hierarchical configurations per se. So all enhanced</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> * features provided by a hierarchical configuration (e.g. choosing an</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> * expression engine) are applicable.</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> * The class works by registering itself as an event listener at all added</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> * configurations. So it gets notified whenever one of these configurations is</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> * changed and can invalidate its internal node structure. The next time a</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>  <em class="jxr_javadoccomment"> * property is accessed the node structure will be re-constructed using the</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  <em class="jxr_javadoccomment"> * current state of the managed configurations. Note that, depending on the used</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  <em class="jxr_javadoccomment"> * {@code NodeCombiner}, this may be a complex operation.</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment"> * Because of the way a {@code CombinedConfiguration} is working it has</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>  <em class="jxr_javadoccomment"> * more or less view character: it provides a logic view on the configurations</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>  <em class="jxr_javadoccomment"> * it contains. In this constellation not all methods defined for hierarchical</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> * configurations - especially methods that update the stored properties - can</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> * be implemented in a consistent manner. Using such methods (like</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> * {@code addProperty()}, or {@code clearProperty()} on a</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> * {@code CombinedConfiguration} is not strictly forbidden, however,</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> * depending on the current {@link NodeCombiner} and the involved</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> * properties, the results may be different than expected. Some examples may</em>
<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> * illustrate this:</em>
<a class="jxr_linenumber" name="81" href="#81">81</a>  <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="82" href="#82">82</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment"> * &lt;ul&gt;</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment"> * &lt;li&gt;Imagine a {@code CombinedConfiguration} &lt;em&gt;cc&lt;/em&gt; containing</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_javadoccomment"> * two child configurations with the following content:</em>
<a class="jxr_linenumber" name="86" href="#86">86</a>  <em class="jxr_javadoccomment"> * &lt;dl&gt;</em>
<a class="jxr_linenumber" name="87" href="#87">87</a>  <em class="jxr_javadoccomment"> * &lt;dt&gt;user.properties&lt;/dt&gt;</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>  <em class="jxr_javadoccomment"> * &lt;dd&gt;</em>
<a class="jxr_linenumber" name="89" href="#89">89</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="90" href="#90">90</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="91" href="#91">91</a>  <em class="jxr_javadoccomment"> * gui.background = blue</em>
<a class="jxr_linenumber" name="92" href="#92">92</a>  <em class="jxr_javadoccomment"> * gui.position = (10, 10, 400, 200)</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>  <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="95" href="#95">95</a>  <em class="jxr_javadoccomment"> * &lt;/dd&gt;</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>  <em class="jxr_javadoccomment"> * &lt;dt&gt;default.properties&lt;/dt&gt;</em>
<a class="jxr_linenumber" name="97" href="#97">97</a>  <em class="jxr_javadoccomment"> * &lt;dd&gt;</em>
<a class="jxr_linenumber" name="98" href="#98">98</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="99" href="#99">99</a>  <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * gui.background = black</em>
<a class="jxr_linenumber" name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * gui.foreground = white</em>
<a class="jxr_linenumber" name="102" href="#102">102</a> <em class="jxr_javadoccomment"> * home.dir = /data</em>
<a class="jxr_linenumber" name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="104" href="#104">104</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * &lt;/dd&gt;</em>
<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * &lt;/dl&gt;</em>
<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment"> * As a {@code NodeCombiner} a</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * {@link org.apache.commons.configuration.tree.OverrideCombiner OverrideCombiner}</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment"> * is used. This combiner will ensure that defined user settings take precedence</em>
<a class="jxr_linenumber" name="110" href="#110">110</a> <em class="jxr_javadoccomment"> * over the default values. If the resulting {@code CombinedConfiguration}</em>
<a class="jxr_linenumber" name="111" href="#111">111</a> <em class="jxr_javadoccomment"> * is queried for the background color, {@code blue} will be returned</em>
<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment"> * because this value is defined in {@code user.properties}. Now</em>
<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment"> * consider what happens if the key {@code gui.background} is removed</em>
<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment"> * from the {@code CombinedConfiguration}:</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment"> * &lt;pre&gt;cc.clearProperty("gui.background");&lt;/pre&gt;</em>
<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment"> * Will a {@code cc.containsKey("gui.background")} now return &lt;b&gt;false&lt;/b&gt;?</em>
<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment"> * No, it won't! The {@code clearProperty()} operation is executed on the</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment"> * node set of the combined configuration, which was constructed from the nodes</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment"> * of the two child configurations. It causes the value of the</em>
<a class="jxr_linenumber" name="122" href="#122">122</a> <em class="jxr_javadoccomment"> * &lt;em&gt;background&lt;/em&gt; node to be cleared, which is also part of the first</em>
<a class="jxr_linenumber" name="123" href="#123">123</a> <em class="jxr_javadoccomment"> * child configuration. This modification of one of its child configurations</em>
<a class="jxr_linenumber" name="124" href="#124">124</a> <em class="jxr_javadoccomment"> * causes the {@code CombinedConfiguration} to be re-constructed. This</em>
<a class="jxr_linenumber" name="125" href="#125">125</a> <em class="jxr_javadoccomment"> * time the {@code OverrideCombiner} cannot find a</em>
<a class="jxr_linenumber" name="126" href="#126">126</a> <em class="jxr_javadoccomment"> * {@code gui.background} property in the first child configuration, but</em>
<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment"> * it finds one in the second, and adds it to the resulting combined</em>
<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment"> * configuration. So the property is still present (with a different value now).&lt;/li&gt;</em>
<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment"> * &lt;li&gt;{@code addProperty()} can also be problematic: Most node</em>
<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment"> * combiners use special view nodes for linking parts of the original</em>
<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment"> * configurations' data together. If new properties are added to such a special</em>
<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment"> * node, they do not belong to any of the managed configurations and thus hang</em>
<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment"> * in the air. Using the same configurations as in the last example, the</em>
<a class="jxr_linenumber" name="134" href="#134">134</a> <em class="jxr_javadoccomment"> * statement</em>
<a class="jxr_linenumber" name="135" href="#135">135</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="136" href="#136">136</a> <em class="jxr_javadoccomment"> * &lt;pre&gt;</em>
<a class="jxr_linenumber" name="137" href="#137">137</a> <em class="jxr_javadoccomment"> * addProperty("database.user", "scott");</em>
<a class="jxr_linenumber" name="138" href="#138">138</a> <em class="jxr_javadoccomment"> * &lt;/pre&gt;</em>
<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="140" href="#140">140</a> <em class="jxr_javadoccomment"> * would cause such a hanging property. If now one of the child configurations</em>
<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment"> * is changed and the {@code CombinedConfiguration} is re-constructed,</em>
<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment"> * this property will disappear! (Add operations are not problematic if they</em>
<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment"> * result in a child configuration being updated. For instance an</em>
<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment"> * {@code addProperty("home.url", "localhost");} will alter the second</em>
<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment"> * child configuration - because the prefix &lt;em&gt;home&lt;/em&gt; is here already</em>
<a class="jxr_linenumber" name="146" href="#146">146</a> <em class="jxr_javadoccomment"> * present; when the {@code CombinedConfiguration} is re-constructed,</em>
<a class="jxr_linenumber" name="147" href="#147">147</a> <em class="jxr_javadoccomment"> * this change is taken into account.)&lt;/li&gt;</em>
<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment"> * &lt;/ul&gt;</em>
<a class="jxr_linenumber" name="149" href="#149">149</a> <em class="jxr_javadoccomment"> * Because of such problems it is recommended to perform updates only on the</em>
<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment"> * managed child configurations.</em>
<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="152" href="#152">152</a> <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="153" href="#153">153</a> <em class="jxr_javadoccomment"> * Whenever the node structure of a {@code CombinedConfiguration} becomes</em>
<a class="jxr_linenumber" name="154" href="#154">154</a> <em class="jxr_javadoccomment"> * invalid (either because one of the contained configurations was modified or</em>
<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_javadoccomment"> * because the {@code invalidate()} method was directly called) an event</em>
<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment"> * is generated. So this can be detected by interested event listeners. This</em>
<a class="jxr_linenumber" name="157" href="#157">157</a> <em class="jxr_javadoccomment"> * also makes it possible to add a combined configuration into another one.</em>
<a class="jxr_linenumber" name="158" href="#158">158</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="159" href="#159">159</a> <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="160" href="#160">160</a> <em class="jxr_javadoccomment"> * Implementation note: Adding and removing configurations to and from a</em>
<a class="jxr_linenumber" name="161" href="#161">161</a> <em class="jxr_javadoccomment"> * combined configuration is not thread-safe. If a combined configuration is</em>
<a class="jxr_linenumber" name="162" href="#162">162</a> <em class="jxr_javadoccomment"> * manipulated by multiple threads, the developer has to take care about</em>
<a class="jxr_linenumber" name="163" href="#163">163</a> <em class="jxr_javadoccomment"> * properly synchronization.</em>
<a class="jxr_linenumber" name="164" href="#164">164</a> <em class="jxr_javadoccomment"> * &lt;/p&gt;</em>
<a class="jxr_linenumber" name="165" href="#165">165</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="166" href="#166">166</a> <em class="jxr_javadoccomment"> * @author &lt;a</em>
<a class="jxr_linenumber" name="167" href="#167">167</a> <em class="jxr_javadoccomment"> * href="<a href="http://commons.apache.org/configuration/team-list.html" target="alexandria_uri">http://commons.apache.org/configuration/team-list.html</a>"&gt;Commons</em>
<a class="jxr_linenumber" name="168" href="#168">168</a> <em class="jxr_javadoccomment"> * Configuration team&lt;/a&gt;</em>
<a class="jxr_linenumber" name="169" href="#169">169</a> <em class="jxr_javadoccomment"> * @since 1.3</em>
<a class="jxr_linenumber" name="170" href="#170">170</a> <em class="jxr_javadoccomment"> * @version $Id: CombinedConfiguration.java 1234985 2012-01-23 21:09:09Z oheger $</em>
<a class="jxr_linenumber" name="171" href="#171">171</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="172" href="#172">172</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/CombinedConfiguration.html">CombinedConfiguration</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../org/apache/commons/configuration/HierarchicalReloadableConfiguration.html">HierarchicalReloadableConfiguration</a> <strong class="jxr_keyword">implements</strong>
<a class="jxr_linenumber" name="173" href="#173">173</a>         ConfigurationListener, Cloneable
<a class="jxr_linenumber" name="174" href="#174">174</a> {
<a class="jxr_linenumber" name="175" href="#175">175</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="176" href="#176">176</a> <em class="jxr_javadoccomment">     * Constant for the invalidate event that is fired when the internal node</em>
<a class="jxr_linenumber" name="177" href="#177">177</a> <em class="jxr_javadoccomment">     * structure becomes invalid.</em>
<a class="jxr_linenumber" name="178" href="#178">178</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="179" href="#179">179</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> EVENT_COMBINED_INVALIDATE = 40;
<a class="jxr_linenumber" name="180" href="#180">180</a> 
<a class="jxr_linenumber" name="181" href="#181">181</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="182" href="#182">182</a> <em class="jxr_javadoccomment">     * The serial version ID.</em>
<a class="jxr_linenumber" name="183" href="#183">183</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="184" href="#184">184</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = 8338574525528692307L;
<a class="jxr_linenumber" name="185" href="#185">185</a> 
<a class="jxr_linenumber" name="186" href="#186">186</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Constant for the expression engine for parsing the at path. */</em>
<a class="jxr_linenumber" name="187" href="#187">187</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/commons/configuration/tree/DefaultExpressionEngine.html">DefaultExpressionEngine</a> AT_ENGINE = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/DefaultExpressionEngine.html">DefaultExpressionEngine</a>();
<a class="jxr_linenumber" name="188" href="#188">188</a> 
<a class="jxr_linenumber" name="189" href="#189">189</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Constant for the default node combiner. */</em>
<a class="jxr_linenumber" name="190" href="#190">190</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/commons/configuration/tree/NodeCombiner.html">NodeCombiner</a> DEFAULT_COMBINER = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/UnionCombiner.html">UnionCombiner</a>();
<a class="jxr_linenumber" name="191" href="#191">191</a> 
<a class="jxr_linenumber" name="192" href="#192">192</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Constant for the name of the property used for the reload check.*/</em>
<a class="jxr_linenumber" name="193" href="#193">193</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> String PROP_RELOAD_CHECK = <span class="jxr_string">"CombinedConfigurationReloadCheck"</span>;
<a class="jxr_linenumber" name="194" href="#194">194</a> 
<a class="jxr_linenumber" name="195" href="#195">195</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the combiner. */</em>
<a class="jxr_linenumber" name="196" href="#196">196</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/tree/NodeCombiner.html">NodeCombiner</a> nodeCombiner;
<a class="jxr_linenumber" name="197" href="#197">197</a> 
<a class="jxr_linenumber" name="198" href="#198">198</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the combined root node. */</em>
<a class="jxr_linenumber" name="199" href="#199">199</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">volatile</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> combinedRoot;
<a class="jxr_linenumber" name="200" href="#200">200</a> 
<a class="jxr_linenumber" name="201" href="#201">201</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores a list with the contained configurations. */</em>
<a class="jxr_linenumber" name="202" href="#202">202</a>     <strong class="jxr_keyword">private</strong> List&lt;ConfigData&gt; configurations;
<a class="jxr_linenumber" name="203" href="#203">203</a> 
<a class="jxr_linenumber" name="204" href="#204">204</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores a map with the named configurations. */</em>
<a class="jxr_linenumber" name="205" href="#205">205</a>     <strong class="jxr_keyword">private</strong> Map&lt;String, AbstractConfiguration&gt; namedConfigurations;
<a class="jxr_linenumber" name="206" href="#206">206</a> 
<a class="jxr_linenumber" name="207" href="#207">207</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The default behavior is to ignore exceptions that occur during reload */</em>
<a class="jxr_linenumber" name="208" href="#208">208</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> ignoreReloadExceptions = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="209" href="#209">209</a> 
<a class="jxr_linenumber" name="210" href="#210">210</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Set to true when the backing file has changed */</em>
<a class="jxr_linenumber" name="211" href="#211">211</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> reloadRequired;
<a class="jxr_linenumber" name="212" href="#212">212</a> 
<a class="jxr_linenumber" name="213" href="#213">213</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="214" href="#214">214</a> <em class="jxr_javadoccomment">     * An expression engine used for converting child configurations to</em>
<a class="jxr_linenumber" name="215" href="#215">215</a> <em class="jxr_javadoccomment">     * hierarchical ones.</em>
<a class="jxr_linenumber" name="216" href="#216">216</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="217" href="#217">217</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> conversionExpressionEngine;
<a class="jxr_linenumber" name="218" href="#218">218</a> 
<a class="jxr_linenumber" name="219" href="#219">219</a>     <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> A flag whether an enhanced reload check is to be performed.*/</em>
<a class="jxr_linenumber" name="220" href="#220">220</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> forceReloadCheck;
<a class="jxr_linenumber" name="221" href="#221">221</a> 
<a class="jxr_linenumber" name="222" href="#222">222</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="223" href="#223">223</a> <em class="jxr_javadoccomment">     * Creates a new instance of {@code CombinedConfiguration} and</em>
<a class="jxr_linenumber" name="224" href="#224">224</a> <em class="jxr_javadoccomment">     * initializes the combiner to be used.</em>
<a class="jxr_linenumber" name="225" href="#225">225</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="226" href="#226">226</a> <em class="jxr_javadoccomment">     * @param comb the node combiner (can be &lt;b&gt;null&lt;/b&gt;, then a union combiner</em>
<a class="jxr_linenumber" name="227" href="#227">227</a> <em class="jxr_javadoccomment">     * is used as default)</em>
<a class="jxr_linenumber" name="228" href="#228">228</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="229" href="#229">229</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/CombinedConfiguration.html">CombinedConfiguration</a>(<a href="../../../../org/apache/commons/configuration/tree/NodeCombiner.html">NodeCombiner</a> comb)
<a class="jxr_linenumber" name="230" href="#230">230</a>     {
<a class="jxr_linenumber" name="231" href="#231">231</a>         setNodeCombiner((comb != <strong class="jxr_keyword">null</strong>) ? comb : DEFAULT_COMBINER);
<a class="jxr_linenumber" name="232" href="#232">232</a>         clear();
<a class="jxr_linenumber" name="233" href="#233">233</a>     }
<a class="jxr_linenumber" name="234" href="#234">234</a> 
<a class="jxr_linenumber" name="235" href="#235">235</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/CombinedConfiguration.html">CombinedConfiguration</a>(<a href="../../../../org/apache/commons/configuration/tree/NodeCombiner.html">NodeCombiner</a> comb, <a href="../../../../org/apache/commons/configuration/Lock.html">Lock</a> lock)
<a class="jxr_linenumber" name="236" href="#236">236</a>     {
<a class="jxr_linenumber" name="237" href="#237">237</a>         <strong class="jxr_keyword">super</strong>(lock);
<a class="jxr_linenumber" name="238" href="#238">238</a>         setNodeCombiner((comb != <strong class="jxr_keyword">null</strong>) ? comb : DEFAULT_COMBINER);
<a class="jxr_linenumber" name="239" href="#239">239</a>         clear();
<a class="jxr_linenumber" name="240" href="#240">240</a>     }
<a class="jxr_linenumber" name="241" href="#241">241</a> 
<a class="jxr_linenumber" name="242" href="#242">242</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/CombinedConfiguration.html">CombinedConfiguration</a>(<a href="../../../../org/apache/commons/configuration/Lock.html">Lock</a> lock)
<a class="jxr_linenumber" name="243" href="#243">243</a>     {
<a class="jxr_linenumber" name="244" href="#244">244</a>         <strong class="jxr_keyword">this</strong>(<strong class="jxr_keyword">null</strong>, lock);
<a class="jxr_linenumber" name="245" href="#245">245</a>     }
<a class="jxr_linenumber" name="246" href="#246">246</a> 
<a class="jxr_linenumber" name="247" href="#247">247</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="248" href="#248">248</a> <em class="jxr_javadoccomment">     * Creates a new instance of {@code CombinedConfiguration} that uses</em>
<a class="jxr_linenumber" name="249" href="#249">249</a> <em class="jxr_javadoccomment">     * a union combiner.</em>
<a class="jxr_linenumber" name="250" href="#250">250</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="251" href="#251">251</a> <em class="jxr_javadoccomment">     * @see org.apache.commons.configuration.tree.UnionCombiner</em>
<a class="jxr_linenumber" name="252" href="#252">252</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="253" href="#253">253</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/CombinedConfiguration.html">CombinedConfiguration</a>()
<a class="jxr_linenumber" name="254" href="#254">254</a>     {
<a class="jxr_linenumber" name="255" href="#255">255</a>         <strong class="jxr_keyword">this</strong>(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="256" href="#256">256</a>     }
<a class="jxr_linenumber" name="257" href="#257">257</a> 
<a class="jxr_linenumber" name="258" href="#258">258</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="259" href="#259">259</a> <em class="jxr_javadoccomment">     * Returns the node combiner that is used for creating the combined node</em>
<a class="jxr_linenumber" name="260" href="#260">260</a> <em class="jxr_javadoccomment">     * structure.</em>
<a class="jxr_linenumber" name="261" href="#261">261</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="262" href="#262">262</a> <em class="jxr_javadoccomment">     * @return the node combiner</em>
<a class="jxr_linenumber" name="263" href="#263">263</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="264" href="#264">264</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/NodeCombiner.html">NodeCombiner</a> getNodeCombiner()
<a class="jxr_linenumber" name="265" href="#265">265</a>     {
<a class="jxr_linenumber" name="266" href="#266">266</a>         <strong class="jxr_keyword">return</strong> nodeCombiner;
<a class="jxr_linenumber" name="267" href="#267">267</a>     }
<a class="jxr_linenumber" name="268" href="#268">268</a> 
<a class="jxr_linenumber" name="269" href="#269">269</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="270" href="#270">270</a> <em class="jxr_javadoccomment">     * Sets the node combiner. This object will be used when the combined node</em>
<a class="jxr_linenumber" name="271" href="#271">271</a> <em class="jxr_javadoccomment">     * structure is to be constructed. It must not be &lt;b&gt;null&lt;/b&gt;, otherwise an</em>
<a class="jxr_linenumber" name="272" href="#272">272</a> <em class="jxr_javadoccomment">     * {@code IllegalArgumentException} exception is thrown. Changing the</em>
<a class="jxr_linenumber" name="273" href="#273">273</a> <em class="jxr_javadoccomment">     * node combiner causes an invalidation of this combined configuration, so</em>
<a class="jxr_linenumber" name="274" href="#274">274</a> <em class="jxr_javadoccomment">     * that the new combiner immediately takes effect.</em>
<a class="jxr_linenumber" name="275" href="#275">275</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="276" href="#276">276</a> <em class="jxr_javadoccomment">     * @param nodeCombiner the node combiner</em>
<a class="jxr_linenumber" name="277" href="#277">277</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="278" href="#278">278</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setNodeCombiner(<a href="../../../../org/apache/commons/configuration/tree/NodeCombiner.html">NodeCombiner</a> nodeCombiner)
<a class="jxr_linenumber" name="279" href="#279">279</a>     {
<a class="jxr_linenumber" name="280" href="#280">280</a>         <strong class="jxr_keyword">if</strong> (nodeCombiner == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="281" href="#281">281</a>         {
<a class="jxr_linenumber" name="282" href="#282">282</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="283" href="#283">283</a>                     <span class="jxr_string">"Node combiner must not be null!"</span>);
<a class="jxr_linenumber" name="284" href="#284">284</a>         }
<a class="jxr_linenumber" name="285" href="#285">285</a>         <strong class="jxr_keyword">this</strong>.nodeCombiner = nodeCombiner;
<a class="jxr_linenumber" name="286" href="#286">286</a>         invalidate();
<a class="jxr_linenumber" name="287" href="#287">287</a>     }
<a class="jxr_linenumber" name="288" href="#288">288</a> 
<a class="jxr_linenumber" name="289" href="#289">289</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="290" href="#290">290</a> <em class="jxr_javadoccomment">     * Returns a flag whether an enhanced reload check must be performed.</em>
<a class="jxr_linenumber" name="291" href="#291">291</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="292" href="#292">292</a> <em class="jxr_javadoccomment">     * @return the force reload check flag</em>
<a class="jxr_linenumber" name="293" href="#293">293</a> <em class="jxr_javadoccomment">     * @since 1.4</em>
<a class="jxr_linenumber" name="294" href="#294">294</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="295" href="#295">295</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isForceReloadCheck()
<a class="jxr_linenumber" name="296" href="#296">296</a>     {
<a class="jxr_linenumber" name="297" href="#297">297</a>         <strong class="jxr_keyword">return</strong> forceReloadCheck;
<a class="jxr_linenumber" name="298" href="#298">298</a>     }
<a class="jxr_linenumber" name="299" href="#299">299</a> 
<a class="jxr_linenumber" name="300" href="#300">300</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="301" href="#301">301</a> <em class="jxr_javadoccomment">     * Sets the force reload check flag. If this flag is set, each property</em>
<a class="jxr_linenumber" name="302" href="#302">302</a> <em class="jxr_javadoccomment">     * access on this configuration will cause a reload check on the contained</em>
<a class="jxr_linenumber" name="303" href="#303">303</a> <em class="jxr_javadoccomment">     * configurations. This is a workaround for a problem with some reload</em>
<a class="jxr_linenumber" name="304" href="#304">304</a> <em class="jxr_javadoccomment">     * implementations that only check if a reload is required when they are</em>
<a class="jxr_linenumber" name="305" href="#305">305</a> <em class="jxr_javadoccomment">     * triggered. Per default this mode is disabled. If the force reload check</em>
<a class="jxr_linenumber" name="306" href="#306">306</a> <em class="jxr_javadoccomment">     * flag is set to &lt;b&gt;true&lt;/b&gt;, accessing properties will be less</em>
<a class="jxr_linenumber" name="307" href="#307">307</a> <em class="jxr_javadoccomment">     * efficient, but reloads on contained configurations will be detected.</em>
<a class="jxr_linenumber" name="308" href="#308">308</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="309" href="#309">309</a> <em class="jxr_javadoccomment">     * @param forceReloadCheck the value of the flag</em>
<a class="jxr_linenumber" name="310" href="#310">310</a> <em class="jxr_javadoccomment">     * @since 1.4</em>
<a class="jxr_linenumber" name="311" href="#311">311</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="312" href="#312">312</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setForceReloadCheck(<strong class="jxr_keyword">boolean</strong> forceReloadCheck)
<a class="jxr_linenumber" name="313" href="#313">313</a>     {
<a class="jxr_linenumber" name="314" href="#314">314</a>         <strong class="jxr_keyword">this</strong>.forceReloadCheck = forceReloadCheck;
<a class="jxr_linenumber" name="315" href="#315">315</a>     }
<a class="jxr_linenumber" name="316" href="#316">316</a> 
<a class="jxr_linenumber" name="317" href="#317">317</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="318" href="#318">318</a> <em class="jxr_javadoccomment">     * Returns the {@code ExpressionEngine} for converting flat child</em>
<a class="jxr_linenumber" name="319" href="#319">319</a> <em class="jxr_javadoccomment">     * configurations to hierarchical ones.</em>
<a class="jxr_linenumber" name="320" href="#320">320</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="321" href="#321">321</a> <em class="jxr_javadoccomment">     * @return the conversion expression engine</em>
<a class="jxr_linenumber" name="322" href="#322">322</a> <em class="jxr_javadoccomment">     * @since 1.6</em>
<a class="jxr_linenumber" name="323" href="#323">323</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="324" href="#324">324</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> getConversionExpressionEngine()
<a class="jxr_linenumber" name="325" href="#325">325</a>     {
<a class="jxr_linenumber" name="326" href="#326">326</a>         <strong class="jxr_keyword">return</strong> conversionExpressionEngine;
<a class="jxr_linenumber" name="327" href="#327">327</a>     }
<a class="jxr_linenumber" name="328" href="#328">328</a> 
<a class="jxr_linenumber" name="329" href="#329">329</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="330" href="#330">330</a> <em class="jxr_javadoccomment">     * Sets the {@code ExpressionEngine} for converting flat child</em>
<a class="jxr_linenumber" name="331" href="#331">331</a> <em class="jxr_javadoccomment">     * configurations to hierarchical ones. When constructing the root node for</em>
<a class="jxr_linenumber" name="332" href="#332">332</a> <em class="jxr_javadoccomment">     * this combined configuration the properties of all child configurations</em>
<a class="jxr_linenumber" name="333" href="#333">333</a> <em class="jxr_javadoccomment">     * must be combined to a single hierarchical node structure. In this</em>
<a class="jxr_linenumber" name="334" href="#334">334</a> <em class="jxr_javadoccomment">     * process, non hierarchical configurations are converted to hierarchical</em>
<a class="jxr_linenumber" name="335" href="#335">335</a> <em class="jxr_javadoccomment">     * ones first. This can be problematic if a child configuration contains</em>
<a class="jxr_linenumber" name="336" href="#336">336</a> <em class="jxr_javadoccomment">     * keys that are no compatible with the default expression engine used by</em>
<a class="jxr_linenumber" name="337" href="#337">337</a> <em class="jxr_javadoccomment">     * hierarchical configurations. Therefore it is possible to specify a</em>
<a class="jxr_linenumber" name="338" href="#338">338</a> <em class="jxr_javadoccomment">     * specific expression engine to be used for this purpose.</em>
<a class="jxr_linenumber" name="339" href="#339">339</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="340" href="#340">340</a> <em class="jxr_javadoccomment">     * @param conversionExpressionEngine the conversion expression engine</em>
<a class="jxr_linenumber" name="341" href="#341">341</a> <em class="jxr_javadoccomment">     * @see ConfigurationUtils#convertToHierarchical(Configuration, ExpressionEngine)</em>
<a class="jxr_linenumber" name="342" href="#342">342</a> <em class="jxr_javadoccomment">     * @since 1.6</em>
<a class="jxr_linenumber" name="343" href="#343">343</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="344" href="#344">344</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setConversionExpressionEngine(
<a class="jxr_linenumber" name="345" href="#345">345</a>             <a href="../../../../org/apache/commons/configuration/tree/ExpressionEngine.html">ExpressionEngine</a> conversionExpressionEngine)
<a class="jxr_linenumber" name="346" href="#346">346</a>     {
<a class="jxr_linenumber" name="347" href="#347">347</a>         <strong class="jxr_keyword">this</strong>.conversionExpressionEngine = conversionExpressionEngine;
<a class="jxr_linenumber" name="348" href="#348">348</a>     }
<a class="jxr_linenumber" name="349" href="#349">349</a> 
<a class="jxr_linenumber" name="350" href="#350">350</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="351" href="#351">351</a> <em class="jxr_javadoccomment">     * Retrieves the value of the ignoreReloadExceptions flag.</em>
<a class="jxr_linenumber" name="352" href="#352">352</a> <em class="jxr_javadoccomment">     * @return true if exceptions are ignored, false otherwise.</em>
<a class="jxr_linenumber" name="353" href="#353">353</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="354" href="#354">354</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isIgnoreReloadExceptions()
<a class="jxr_linenumber" name="355" href="#355">355</a>     {
<a class="jxr_linenumber" name="356" href="#356">356</a>         <strong class="jxr_keyword">return</strong> ignoreReloadExceptions;
<a class="jxr_linenumber" name="357" href="#357">357</a>     }
<a class="jxr_linenumber" name="358" href="#358">358</a> 
<a class="jxr_linenumber" name="359" href="#359">359</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="360" href="#360">360</a> <em class="jxr_javadoccomment">     * If set to true then exceptions that occur during reloading will be</em>
<a class="jxr_linenumber" name="361" href="#361">361</a> <em class="jxr_javadoccomment">     * ignored. If false then the exceptions will be allowed to be thrown</em>
<a class="jxr_linenumber" name="362" href="#362">362</a> <em class="jxr_javadoccomment">     * back to the caller.</em>
<a class="jxr_linenumber" name="363" href="#363">363</a> <em class="jxr_javadoccomment">     * @param ignoreReloadExceptions true if exceptions should be ignored.</em>
<a class="jxr_linenumber" name="364" href="#364">364</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="365" href="#365">365</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setIgnoreReloadExceptions(<strong class="jxr_keyword">boolean</strong> ignoreReloadExceptions)
<a class="jxr_linenumber" name="366" href="#366">366</a>     {
<a class="jxr_linenumber" name="367" href="#367">367</a>         <strong class="jxr_keyword">this</strong>.ignoreReloadExceptions = ignoreReloadExceptions;
<a class="jxr_linenumber" name="368" href="#368">368</a>     }
<a class="jxr_linenumber" name="369" href="#369">369</a> 
<a class="jxr_linenumber" name="370" href="#370">370</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="371" href="#371">371</a> <em class="jxr_javadoccomment">     * Adds a new configuration to this combined configuration. It is possible</em>
<a class="jxr_linenumber" name="372" href="#372">372</a> <em class="jxr_javadoccomment">     * (but not mandatory) to give the new configuration a name. This name must</em>
<a class="jxr_linenumber" name="373" href="#373">373</a> <em class="jxr_javadoccomment">     * be unique, otherwise a {@code ConfigurationRuntimeException} will</em>
<a class="jxr_linenumber" name="374" href="#374">374</a> <em class="jxr_javadoccomment">     * be thrown. With the optional {@code at} argument you can specify</em>
<a class="jxr_linenumber" name="375" href="#375">375</a> <em class="jxr_javadoccomment">     * where in the resulting node structure the content of the added</em>
<a class="jxr_linenumber" name="376" href="#376">376</a> <em class="jxr_javadoccomment">     * configuration should appear. This is a string that uses dots as property</em>
<a class="jxr_linenumber" name="377" href="#377">377</a> <em class="jxr_javadoccomment">     * delimiters (independent on the current expression engine). For instance</em>
<a class="jxr_linenumber" name="378" href="#378">378</a> <em class="jxr_javadoccomment">     * if you pass in the string {@code "database.tables"},</em>
<a class="jxr_linenumber" name="379" href="#379">379</a> <em class="jxr_javadoccomment">     * all properties of the added configuration will occur in this branch.</em>
<a class="jxr_linenumber" name="380" href="#380">380</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="381" href="#381">381</a> <em class="jxr_javadoccomment">     * @param config the configuration to add (must not be &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="382" href="#382">382</a> <em class="jxr_javadoccomment">     * @param name the name of this configuration (can be &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="383" href="#383">383</a> <em class="jxr_javadoccomment">     * @param at the position of this configuration in the combined tree (can be</em>
<a class="jxr_linenumber" name="384" href="#384">384</a> <em class="jxr_javadoccomment">     * &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="385" href="#385">385</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="386" href="#386">386</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addConfiguration(<a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> config, String name,
<a class="jxr_linenumber" name="387" href="#387">387</a>             String at)
<a class="jxr_linenumber" name="388" href="#388">388</a>     {
<a class="jxr_linenumber" name="389" href="#389">389</a>         <strong class="jxr_keyword">if</strong> (config == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="390" href="#390">390</a>         {
<a class="jxr_linenumber" name="391" href="#391">391</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="392" href="#392">392</a>                     <span class="jxr_string">"Added configuration must not be null!"</span>);
<a class="jxr_linenumber" name="393" href="#393">393</a>         }
<a class="jxr_linenumber" name="394" href="#394">394</a>         <strong class="jxr_keyword">if</strong> (name != <strong class="jxr_keyword">null</strong> &amp;&amp; namedConfigurations.containsKey(name))
<a class="jxr_linenumber" name="395" href="#395">395</a>         {
<a class="jxr_linenumber" name="396" href="#396">396</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/ConfigurationRuntimeException.html">ConfigurationRuntimeException</a>(
<a class="jxr_linenumber" name="397" href="#397">397</a>                     <span class="jxr_string">"A configuration with the name '"</span>
<a class="jxr_linenumber" name="398" href="#398">398</a>                             + name
<a class="jxr_linenumber" name="399" href="#399">399</a>                             + <span class="jxr_string">"' already exists in this combined configuration!"</span>);
<a class="jxr_linenumber" name="400" href="#400">400</a>         }
<a class="jxr_linenumber" name="401" href="#401">401</a> 
<a class="jxr_linenumber" name="402" href="#402">402</a>         <a href="../../../../org/apache/commons/configuration/DynamicCombinedConfiguration.html">ConfigData</a> cd = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/DynamicCombinedConfiguration.html">ConfigData</a>(config, name, at);
<a class="jxr_linenumber" name="403" href="#403">403</a>         <strong class="jxr_keyword">if</strong> (getLogger().isDebugEnabled())
<a class="jxr_linenumber" name="404" href="#404">404</a>         {
<a class="jxr_linenumber" name="405" href="#405">405</a>             getLogger().debug(<span class="jxr_string">"Adding configuration "</span> + config + <span class="jxr_string">" with name "</span> + name);
<a class="jxr_linenumber" name="406" href="#406">406</a>         }
<a class="jxr_linenumber" name="407" href="#407">407</a>         configurations.add(cd);
<a class="jxr_linenumber" name="408" href="#408">408</a>         <strong class="jxr_keyword">if</strong> (name != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="409" href="#409">409</a>         {
<a class="jxr_linenumber" name="410" href="#410">410</a>             namedConfigurations.put(name, config);
<a class="jxr_linenumber" name="411" href="#411">411</a>         }
<a class="jxr_linenumber" name="412" href="#412">412</a> 
<a class="jxr_linenumber" name="413" href="#413">413</a>         config.addConfigurationListener(<strong class="jxr_keyword">this</strong>);
<a class="jxr_linenumber" name="414" href="#414">414</a>         invalidate();
<a class="jxr_linenumber" name="415" href="#415">415</a>     }
<a class="jxr_linenumber" name="416" href="#416">416</a> 
<a class="jxr_linenumber" name="417" href="#417">417</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="418" href="#418">418</a> <em class="jxr_javadoccomment">     * Adds a new configuration to this combined configuration with an optional</em>
<a class="jxr_linenumber" name="419" href="#419">419</a> <em class="jxr_javadoccomment">     * name. The new configuration's properties will be added under the root of</em>
<a class="jxr_linenumber" name="420" href="#420">420</a> <em class="jxr_javadoccomment">     * the combined node structure.</em>
<a class="jxr_linenumber" name="421" href="#421">421</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="422" href="#422">422</a> <em class="jxr_javadoccomment">     * @param config the configuration to add (must not be &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="423" href="#423">423</a> <em class="jxr_javadoccomment">     * @param name the name of this configuration (can be &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="424" href="#424">424</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="425" href="#425">425</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addConfiguration(<a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> config, String name)
<a class="jxr_linenumber" name="426" href="#426">426</a>     {
<a class="jxr_linenumber" name="427" href="#427">427</a>         addConfiguration(config, name, <strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="428" href="#428">428</a>     }
<a class="jxr_linenumber" name="429" href="#429">429</a> 
<a class="jxr_linenumber" name="430" href="#430">430</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="431" href="#431">431</a> <em class="jxr_javadoccomment">     * Adds a new configuration to this combined configuration. The new</em>
<a class="jxr_linenumber" name="432" href="#432">432</a> <em class="jxr_javadoccomment">     * configuration is not given a name. Its properties will be added under the</em>
<a class="jxr_linenumber" name="433" href="#433">433</a> <em class="jxr_javadoccomment">     * root of the combined node structure.</em>
<a class="jxr_linenumber" name="434" href="#434">434</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="435" href="#435">435</a> <em class="jxr_javadoccomment">     * @param config the configuration to add (must not be &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="436" href="#436">436</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="437" href="#437">437</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> addConfiguration(<a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> config)
<a class="jxr_linenumber" name="438" href="#438">438</a>     {
<a class="jxr_linenumber" name="439" href="#439">439</a>         addConfiguration(config, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="440" href="#440">440</a>     }
<a class="jxr_linenumber" name="441" href="#441">441</a> 
<a class="jxr_linenumber" name="442" href="#442">442</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="443" href="#443">443</a> <em class="jxr_javadoccomment">     * Returns the number of configurations that are contained in this combined</em>
<a class="jxr_linenumber" name="444" href="#444">444</a> <em class="jxr_javadoccomment">     * configuration.</em>
<a class="jxr_linenumber" name="445" href="#445">445</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="446" href="#446">446</a> <em class="jxr_javadoccomment">     * @return the number of contained configurations</em>
<a class="jxr_linenumber" name="447" href="#447">447</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="448" href="#448">448</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> getNumberOfConfigurations()
<a class="jxr_linenumber" name="449" href="#449">449</a>     {
<a class="jxr_linenumber" name="450" href="#450">450</a>         <strong class="jxr_keyword">return</strong> configurations.size();
<a class="jxr_linenumber" name="451" href="#451">451</a>     }
<a class="jxr_linenumber" name="452" href="#452">452</a> 
<a class="jxr_linenumber" name="453" href="#453">453</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="454" href="#454">454</a> <em class="jxr_javadoccomment">     * Returns the configuration at the specified index. The contained</em>
<a class="jxr_linenumber" name="455" href="#455">455</a> <em class="jxr_javadoccomment">     * configurations are numbered in the order they were added to this combined</em>
<a class="jxr_linenumber" name="456" href="#456">456</a> <em class="jxr_javadoccomment">     * configuration. The index of the first configuration is 0.</em>
<a class="jxr_linenumber" name="457" href="#457">457</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="458" href="#458">458</a> <em class="jxr_javadoccomment">     * @param index the index</em>
<a class="jxr_linenumber" name="459" href="#459">459</a> <em class="jxr_javadoccomment">     * @return the configuration at this index</em>
<a class="jxr_linenumber" name="460" href="#460">460</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="461" href="#461">461</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> getConfiguration(<strong class="jxr_keyword">int</strong> index)
<a class="jxr_linenumber" name="462" href="#462">462</a>     {
<a class="jxr_linenumber" name="463" href="#463">463</a>         <a href="../../../../org/apache/commons/configuration/DynamicCombinedConfiguration.html">ConfigData</a> cd = configurations.get(index);
<a class="jxr_linenumber" name="464" href="#464">464</a>         <strong class="jxr_keyword">return</strong> cd.getConfiguration();
<a class="jxr_linenumber" name="465" href="#465">465</a>     }
<a class="jxr_linenumber" name="466" href="#466">466</a> 
<a class="jxr_linenumber" name="467" href="#467">467</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="468" href="#468">468</a> <em class="jxr_javadoccomment">     * Returns the configuration with the given name. This can be &lt;b&gt;null&lt;/b&gt;</em>
<a class="jxr_linenumber" name="469" href="#469">469</a> <em class="jxr_javadoccomment">     * if no such configuration exists.</em>
<a class="jxr_linenumber" name="470" href="#470">470</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="471" href="#471">471</a> <em class="jxr_javadoccomment">     * @param name the name of the configuration</em>
<a class="jxr_linenumber" name="472" href="#472">472</a> <em class="jxr_javadoccomment">     * @return the configuration with this name</em>
<a class="jxr_linenumber" name="473" href="#473">473</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="474" href="#474">474</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> getConfiguration(String name)
<a class="jxr_linenumber" name="475" href="#475">475</a>     {
<a class="jxr_linenumber" name="476" href="#476">476</a>         <strong class="jxr_keyword">return</strong> namedConfigurations.get(name);
<a class="jxr_linenumber" name="477" href="#477">477</a>     }
<a class="jxr_linenumber" name="478" href="#478">478</a> 
<a class="jxr_linenumber" name="479" href="#479">479</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="480" href="#480">480</a> <em class="jxr_javadoccomment">     * Returns a List of all the configurations that have been added.</em>
<a class="jxr_linenumber" name="481" href="#481">481</a> <em class="jxr_javadoccomment">     * @return A List of all the configurations.</em>
<a class="jxr_linenumber" name="482" href="#482">482</a> <em class="jxr_javadoccomment">     * @since 1.7</em>
<a class="jxr_linenumber" name="483" href="#483">483</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="484" href="#484">484</a>     <strong class="jxr_keyword">public</strong> List&lt;AbstractConfiguration&gt; getConfigurations()
<a class="jxr_linenumber" name="485" href="#485">485</a>     {
<a class="jxr_linenumber" name="486" href="#486">486</a>         List&lt;AbstractConfiguration&gt; list = <strong class="jxr_keyword">new</strong> ArrayList&lt;AbstractConfiguration&gt;(configurations.size());
<a class="jxr_linenumber" name="487" href="#487">487</a>         <strong class="jxr_keyword">for</strong> (ConfigData cd : configurations)
<a class="jxr_linenumber" name="488" href="#488">488</a>         {
<a class="jxr_linenumber" name="489" href="#489">489</a>             list.add(cd.getConfiguration());
<a class="jxr_linenumber" name="490" href="#490">490</a>         }
<a class="jxr_linenumber" name="491" href="#491">491</a>         <strong class="jxr_keyword">return</strong> list;
<a class="jxr_linenumber" name="492" href="#492">492</a>     }
<a class="jxr_linenumber" name="493" href="#493">493</a> 
<a class="jxr_linenumber" name="494" href="#494">494</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="495" href="#495">495</a> <em class="jxr_javadoccomment">     * Returns a List of the names of all the configurations that have been</em>
<a class="jxr_linenumber" name="496" href="#496">496</a> <em class="jxr_javadoccomment">     * added in the order they were added. A NULL value will be present in</em>
<a class="jxr_linenumber" name="497" href="#497">497</a> <em class="jxr_javadoccomment">     * the list for each configuration that was added without a name.</em>
<a class="jxr_linenumber" name="498" href="#498">498</a> <em class="jxr_javadoccomment">     * @return A List of all the configuration names.</em>
<a class="jxr_linenumber" name="499" href="#499">499</a> <em class="jxr_javadoccomment">     * @since 1.7</em>
<a class="jxr_linenumber" name="500" href="#500">500</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="501" href="#501">501</a>     <strong class="jxr_keyword">public</strong> List&lt;String&gt; getConfigurationNameList()
<a class="jxr_linenumber" name="502" href="#502">502</a>     {
<a class="jxr_linenumber" name="503" href="#503">503</a>         List&lt;String&gt; list = <strong class="jxr_keyword">new</strong> ArrayList&lt;String&gt;(configurations.size());
<a class="jxr_linenumber" name="504" href="#504">504</a>         <strong class="jxr_keyword">for</strong> (ConfigData cd : configurations)
<a class="jxr_linenumber" name="505" href="#505">505</a>         {
<a class="jxr_linenumber" name="506" href="#506">506</a>             list.add(cd.getName());
<a class="jxr_linenumber" name="507" href="#507">507</a>         }
<a class="jxr_linenumber" name="508" href="#508">508</a>         <strong class="jxr_keyword">return</strong> list;
<a class="jxr_linenumber" name="509" href="#509">509</a>     }
<a class="jxr_linenumber" name="510" href="#510">510</a> 
<a class="jxr_linenumber" name="511" href="#511">511</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="512" href="#512">512</a> <em class="jxr_javadoccomment">     * Removes the specified configuration from this combined configuration.</em>
<a class="jxr_linenumber" name="513" href="#513">513</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="514" href="#514">514</a> <em class="jxr_javadoccomment">     * @param config the configuration to be removed</em>
<a class="jxr_linenumber" name="515" href="#515">515</a> <em class="jxr_javadoccomment">     * @return a flag whether this configuration was found and could be removed</em>
<a class="jxr_linenumber" name="516" href="#516">516</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="517" href="#517">517</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> removeConfiguration(<a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> config)
<a class="jxr_linenumber" name="518" href="#518">518</a>     {
<a class="jxr_linenumber" name="519" href="#519">519</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> index = 0; index &lt; getNumberOfConfigurations(); index++)
<a class="jxr_linenumber" name="520" href="#520">520</a>         {
<a class="jxr_linenumber" name="521" href="#521">521</a>             <strong class="jxr_keyword">if</strong> (configurations.get(index).getConfiguration() == config)
<a class="jxr_linenumber" name="522" href="#522">522</a>             {
<a class="jxr_linenumber" name="523" href="#523">523</a>                 removeConfigurationAt(index);
<a class="jxr_linenumber" name="524" href="#524">524</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="525" href="#525">525</a>             }
<a class="jxr_linenumber" name="526" href="#526">526</a>         }
<a class="jxr_linenumber" name="527" href="#527">527</a> 
<a class="jxr_linenumber" name="528" href="#528">528</a>         <strong class="jxr_keyword">return</strong> false;
<a class="jxr_linenumber" name="529" href="#529">529</a>     }
<a class="jxr_linenumber" name="530" href="#530">530</a> 
<a class="jxr_linenumber" name="531" href="#531">531</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="532" href="#532">532</a> <em class="jxr_javadoccomment">     * Removes the configuration at the specified index.</em>
<a class="jxr_linenumber" name="533" href="#533">533</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="534" href="#534">534</a> <em class="jxr_javadoccomment">     * @param index the index</em>
<a class="jxr_linenumber" name="535" href="#535">535</a> <em class="jxr_javadoccomment">     * @return the removed configuration</em>
<a class="jxr_linenumber" name="536" href="#536">536</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="537" href="#537">537</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> removeConfigurationAt(<strong class="jxr_keyword">int</strong> index)
<a class="jxr_linenumber" name="538" href="#538">538</a>     {
<a class="jxr_linenumber" name="539" href="#539">539</a>         <a href="../../../../org/apache/commons/configuration/DynamicCombinedConfiguration.html">ConfigData</a> cd = configurations.remove(index);
<a class="jxr_linenumber" name="540" href="#540">540</a>         <strong class="jxr_keyword">if</strong> (cd.getName() != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="541" href="#541">541</a>         {
<a class="jxr_linenumber" name="542" href="#542">542</a>             namedConfigurations.remove(cd.getName());
<a class="jxr_linenumber" name="543" href="#543">543</a>         }
<a class="jxr_linenumber" name="544" href="#544">544</a>         cd.getConfiguration().removeConfigurationListener(<strong class="jxr_keyword">this</strong>);
<a class="jxr_linenumber" name="545" href="#545">545</a>         invalidate();
<a class="jxr_linenumber" name="546" href="#546">546</a>         <strong class="jxr_keyword">return</strong> cd.getConfiguration();
<a class="jxr_linenumber" name="547" href="#547">547</a>     }
<a class="jxr_linenumber" name="548" href="#548">548</a> 
<a class="jxr_linenumber" name="549" href="#549">549</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="550" href="#550">550</a> <em class="jxr_javadoccomment">     * Removes the configuration with the specified name.</em>
<a class="jxr_linenumber" name="551" href="#551">551</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="552" href="#552">552</a> <em class="jxr_javadoccomment">     * @param name the name of the configuration to be removed</em>
<a class="jxr_linenumber" name="553" href="#553">553</a> <em class="jxr_javadoccomment">     * @return the removed configuration (&lt;b&gt;null&lt;/b&gt; if this configuration</em>
<a class="jxr_linenumber" name="554" href="#554">554</a> <em class="jxr_javadoccomment">     * was not found)</em>
<a class="jxr_linenumber" name="555" href="#555">555</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="556" href="#556">556</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> removeConfiguration(String name)
<a class="jxr_linenumber" name="557" href="#557">557</a>     {
<a class="jxr_linenumber" name="558" href="#558">558</a>         <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> conf = getConfiguration(name);
<a class="jxr_linenumber" name="559" href="#559">559</a>         <strong class="jxr_keyword">if</strong> (conf != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="560" href="#560">560</a>         {
<a class="jxr_linenumber" name="561" href="#561">561</a>             removeConfiguration(conf);
<a class="jxr_linenumber" name="562" href="#562">562</a>         }
<a class="jxr_linenumber" name="563" href="#563">563</a>         <strong class="jxr_keyword">return</strong> conf;
<a class="jxr_linenumber" name="564" href="#564">564</a>     }
<a class="jxr_linenumber" name="565" href="#565">565</a> 
<a class="jxr_linenumber" name="566" href="#566">566</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="567" href="#567">567</a> <em class="jxr_javadoccomment">     * Returns a set with the names of all configurations contained in this</em>
<a class="jxr_linenumber" name="568" href="#568">568</a> <em class="jxr_javadoccomment">     * combined configuration. Of course here are only these configurations</em>
<a class="jxr_linenumber" name="569" href="#569">569</a> <em class="jxr_javadoccomment">     * listed, for which a name was specified when they were added.</em>
<a class="jxr_linenumber" name="570" href="#570">570</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="571" href="#571">571</a> <em class="jxr_javadoccomment">     * @return a set with the names of the contained configurations (never</em>
<a class="jxr_linenumber" name="572" href="#572">572</a> <em class="jxr_javadoccomment">     * &lt;b&gt;null&lt;/b&gt;)</em>
<a class="jxr_linenumber" name="573" href="#573">573</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="574" href="#574">574</a>     <strong class="jxr_keyword">public</strong> Set&lt;String&gt; getConfigurationNames()
<a class="jxr_linenumber" name="575" href="#575">575</a>     {
<a class="jxr_linenumber" name="576" href="#576">576</a>         <strong class="jxr_keyword">return</strong> namedConfigurations.keySet();
<a class="jxr_linenumber" name="577" href="#577">577</a>     }
<a class="jxr_linenumber" name="578" href="#578">578</a> 
<a class="jxr_linenumber" name="579" href="#579">579</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="580" href="#580">580</a> <em class="jxr_javadoccomment">     * Invalidates this combined configuration. This means that the next time a</em>
<a class="jxr_linenumber" name="581" href="#581">581</a> <em class="jxr_javadoccomment">     * property is accessed the combined node structure must be re-constructed.</em>
<a class="jxr_linenumber" name="582" href="#582">582</a> <em class="jxr_javadoccomment">     * Invalidation of a combined configuration also means that an event of type</em>
<a class="jxr_linenumber" name="583" href="#583">583</a> <em class="jxr_javadoccomment">     * {@code EVENT_COMBINED_INVALIDATE} is fired. Note that while other</em>
<a class="jxr_linenumber" name="584" href="#584">584</a> <em class="jxr_javadoccomment">     * events most times appear twice (once before and once after an update),</em>
<a class="jxr_linenumber" name="585" href="#585">585</a> <em class="jxr_javadoccomment">     * this event is only fired once (after update).</em>
<a class="jxr_linenumber" name="586" href="#586">586</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="587" href="#587">587</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> invalidate()
<a class="jxr_linenumber" name="588" href="#588">588</a>     {
<a class="jxr_linenumber" name="589" href="#589">589</a>         reloadRequired = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="590" href="#590">590</a>         fireEvent(EVENT_COMBINED_INVALIDATE, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, false);
<a class="jxr_linenumber" name="591" href="#591">591</a>     }
<a class="jxr_linenumber" name="592" href="#592">592</a> 
<a class="jxr_linenumber" name="593" href="#593">593</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="594" href="#594">594</a> <em class="jxr_javadoccomment">     * Event listener call back for configuration update events. This method is</em>
<a class="jxr_linenumber" name="595" href="#595">595</a> <em class="jxr_javadoccomment">     * called whenever one of the contained configurations was modified. It</em>
<a class="jxr_linenumber" name="596" href="#596">596</a> <em class="jxr_javadoccomment">     * invalidates this combined configuration.</em>
<a class="jxr_linenumber" name="597" href="#597">597</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="598" href="#598">598</a> <em class="jxr_javadoccomment">     * @param event the update event</em>
<a class="jxr_linenumber" name="599" href="#599">599</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="600" href="#600">600</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> configurationChanged(<a href="../../../../org/apache/commons/configuration/event/ConfigurationEvent.html">ConfigurationEvent</a> event)
<a class="jxr_linenumber" name="601" href="#601">601</a>     {
<a class="jxr_linenumber" name="602" href="#602">602</a>         <strong class="jxr_keyword">if</strong> (event.getType() == AbstractFileConfiguration.EVENT_CONFIG_CHANGED)
<a class="jxr_linenumber" name="603" href="#603">603</a>         {
<a class="jxr_linenumber" name="604" href="#604">604</a>             fireEvent(event.getType(), event.getPropertyName(), event.getPropertyValue(), event.isBeforeUpdate());
<a class="jxr_linenumber" name="605" href="#605">605</a>         }
<a class="jxr_linenumber" name="606" href="#606">606</a>         <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (!event.isBeforeUpdate())
<a class="jxr_linenumber" name="607" href="#607">607</a>         {
<a class="jxr_linenumber" name="608" href="#608">608</a>             invalidate();
<a class="jxr_linenumber" name="609" href="#609">609</a>         }
<a class="jxr_linenumber" name="610" href="#610">610</a>     }
<a class="jxr_linenumber" name="611" href="#611">611</a> 
<a class="jxr_linenumber" name="612" href="#612">612</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="613" href="#613">613</a> <em class="jxr_javadoccomment">     * Returns the configuration root node of this combined configuration. This</em>
<a class="jxr_linenumber" name="614" href="#614">614</a> <em class="jxr_javadoccomment">     * method will construct a combined node structure using the current node</em>
<a class="jxr_linenumber" name="615" href="#615">615</a> <em class="jxr_javadoccomment">     * combiner if necessary.</em>
<a class="jxr_linenumber" name="616" href="#616">616</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="617" href="#617">617</a> <em class="jxr_javadoccomment">     * @return the combined root node</em>
<a class="jxr_linenumber" name="618" href="#618">618</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="619" href="#619">619</a>     @Override
<a class="jxr_linenumber" name="620" href="#620">620</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> getRootNode()
<a class="jxr_linenumber" name="621" href="#621">621</a>     {
<a class="jxr_linenumber" name="622" href="#622">622</a>         <strong class="jxr_keyword">synchronized</strong> (getReloadLock())
<a class="jxr_linenumber" name="623" href="#623">623</a>         {
<a class="jxr_linenumber" name="624" href="#624">624</a>             <strong class="jxr_keyword">if</strong> (reloadRequired || combinedRoot == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="625" href="#625">625</a>             {
<a class="jxr_linenumber" name="626" href="#626">626</a>                 combinedRoot = constructCombinedNode();
<a class="jxr_linenumber" name="627" href="#627">627</a>                 reloadRequired = false;
<a class="jxr_linenumber" name="628" href="#628">628</a>             }
<a class="jxr_linenumber" name="629" href="#629">629</a>             <strong class="jxr_keyword">return</strong> combinedRoot;
<a class="jxr_linenumber" name="630" href="#630">630</a>         }
<a class="jxr_linenumber" name="631" href="#631">631</a>     }
<a class="jxr_linenumber" name="632" href="#632">632</a> 
<a class="jxr_linenumber" name="633" href="#633">633</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="634" href="#634">634</a> <em class="jxr_javadoccomment">     * Clears this configuration. All contained configurations will be removed.</em>
<a class="jxr_linenumber" name="635" href="#635">635</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="636" href="#636">636</a>     @Override
<a class="jxr_linenumber" name="637" href="#637">637</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> clear()
<a class="jxr_linenumber" name="638" href="#638">638</a>     {
<a class="jxr_linenumber" name="639" href="#639">639</a>         fireEvent(EVENT_CLEAR, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">true</strong>);
<a class="jxr_linenumber" name="640" href="#640">640</a>         configurations = <strong class="jxr_keyword">new</strong> ArrayList&lt;ConfigData&gt;();
<a class="jxr_linenumber" name="641" href="#641">641</a>         namedConfigurations = <strong class="jxr_keyword">new</strong> HashMap&lt;String, AbstractConfiguration&gt;();
<a class="jxr_linenumber" name="642" href="#642">642</a>         fireEvent(EVENT_CLEAR, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, false);
<a class="jxr_linenumber" name="643" href="#643">643</a>         invalidate();
<a class="jxr_linenumber" name="644" href="#644">644</a>     }
<a class="jxr_linenumber" name="645" href="#645">645</a> 
<a class="jxr_linenumber" name="646" href="#646">646</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="647" href="#647">647</a> <em class="jxr_javadoccomment">     * Returns a copy of this object. This implementation performs a deep clone,</em>
<a class="jxr_linenumber" name="648" href="#648">648</a> <em class="jxr_javadoccomment">     * i.e. all contained configurations will be cloned, too. For this to work,</em>
<a class="jxr_linenumber" name="649" href="#649">649</a> <em class="jxr_javadoccomment">     * all contained configurations must be cloneable. Registered event</em>
<a class="jxr_linenumber" name="650" href="#650">650</a> <em class="jxr_javadoccomment">     * listeners won't be cloned. The clone will use the same node combiner than</em>
<a class="jxr_linenumber" name="651" href="#651">651</a> <em class="jxr_javadoccomment">     * the original.</em>
<a class="jxr_linenumber" name="652" href="#652">652</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="653" href="#653">653</a> <em class="jxr_javadoccomment">     * @return the copied object</em>
<a class="jxr_linenumber" name="654" href="#654">654</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="655" href="#655">655</a>     @Override
<a class="jxr_linenumber" name="656" href="#656">656</a>     <strong class="jxr_keyword">public</strong> Object clone()
<a class="jxr_linenumber" name="657" href="#657">657</a>     {
<a class="jxr_linenumber" name="658" href="#658">658</a>         <a href="../../../../org/apache/commons/configuration/CombinedConfiguration.html">CombinedConfiguration</a> copy = (CombinedConfiguration) <strong class="jxr_keyword">super</strong>.clone();
<a class="jxr_linenumber" name="659" href="#659">659</a>         copy.clear();
<a class="jxr_linenumber" name="660" href="#660">660</a>         <strong class="jxr_keyword">for</strong> (ConfigData cd : configurations)
<a class="jxr_linenumber" name="661" href="#661">661</a>         {
<a class="jxr_linenumber" name="662" href="#662">662</a>             copy.addConfiguration((AbstractConfiguration) ConfigurationUtils
<a class="jxr_linenumber" name="663" href="#663">663</a>                     .cloneConfiguration(cd.getConfiguration()), cd.getName(),
<a class="jxr_linenumber" name="664" href="#664">664</a>                     cd.getAt());
<a class="jxr_linenumber" name="665" href="#665">665</a>         }
<a class="jxr_linenumber" name="666" href="#666">666</a> 
<a class="jxr_linenumber" name="667" href="#667">667</a>         copy.setRootNode(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/DefaultConfigurationNode.html">DefaultConfigurationNode</a>());
<a class="jxr_linenumber" name="668" href="#668">668</a>         <strong class="jxr_keyword">return</strong> copy;
<a class="jxr_linenumber" name="669" href="#669">669</a>     }
<a class="jxr_linenumber" name="670" href="#670">670</a> 
<a class="jxr_linenumber" name="671" href="#671">671</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="672" href="#672">672</a> <em class="jxr_javadoccomment">     * Returns the configuration source, in which the specified key is defined.</em>
<a class="jxr_linenumber" name="673" href="#673">673</a> <em class="jxr_javadoccomment">     * This method will determine the configuration node that is identified by</em>
<a class="jxr_linenumber" name="674" href="#674">674</a> <em class="jxr_javadoccomment">     * the given key. The following constellations are possible:</em>
<a class="jxr_linenumber" name="675" href="#675">675</a> <em class="jxr_javadoccomment">     * &lt;ul&gt;</em>
<a class="jxr_linenumber" name="676" href="#676">676</a> <em class="jxr_javadoccomment">     * &lt;li&gt;If no node object is found for this key, &lt;b&gt;null&lt;/b&gt; is returned.&lt;/li&gt;</em>
<a class="jxr_linenumber" name="677" href="#677">677</a> <em class="jxr_javadoccomment">     * &lt;li&gt;If the key maps to multiple nodes belonging to different</em>
<a class="jxr_linenumber" name="678" href="#678">678</a> <em class="jxr_javadoccomment">     * configuration sources, a {@code IllegalArgumentException} is</em>
<a class="jxr_linenumber" name="679" href="#679">679</a> <em class="jxr_javadoccomment">     * thrown (in this case no unique source can be determined).&lt;/li&gt;</em>
<a class="jxr_linenumber" name="680" href="#680">680</a> <em class="jxr_javadoccomment">     * &lt;li&gt;If exactly one node is found for the key, the (child) configuration</em>
<a class="jxr_linenumber" name="681" href="#681">681</a> <em class="jxr_javadoccomment">     * object, to which the node belongs is determined and returned.&lt;/li&gt;</em>
<a class="jxr_linenumber" name="682" href="#682">682</a> <em class="jxr_javadoccomment">     * &lt;li&gt;For keys that have been added directly to this combined</em>
<a class="jxr_linenumber" name="683" href="#683">683</a> <em class="jxr_javadoccomment">     * configuration and that do not belong to the namespaces defined by</em>
<a class="jxr_linenumber" name="684" href="#684">684</a> <em class="jxr_javadoccomment">     * existing child configurations this configuration will be returned.&lt;/li&gt;</em>
<a class="jxr_linenumber" name="685" href="#685">685</a> <em class="jxr_javadoccomment">     * &lt;/ul&gt;</em>
<a class="jxr_linenumber" name="686" href="#686">686</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="687" href="#687">687</a> <em class="jxr_javadoccomment">     * @param key the key of a configuration property</em>
<a class="jxr_linenumber" name="688" href="#688">688</a> <em class="jxr_javadoccomment">     * @return the configuration, to which this property belongs or &lt;b&gt;null&lt;/b&gt;</em>
<a class="jxr_linenumber" name="689" href="#689">689</a> <em class="jxr_javadoccomment">     * if the key cannot be resolved</em>
<a class="jxr_linenumber" name="690" href="#690">690</a> <em class="jxr_javadoccomment">     * @throws IllegalArgumentException if the key maps to multiple properties</em>
<a class="jxr_linenumber" name="691" href="#691">691</a> <em class="jxr_javadoccomment">     * and the source cannot be determined, or if the key is &lt;b&gt;null&lt;/b&gt;</em>
<a class="jxr_linenumber" name="692" href="#692">692</a> <em class="jxr_javadoccomment">     * @since 1.5</em>
<a class="jxr_linenumber" name="693" href="#693">693</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="694" href="#694">694</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> getSource(String key)
<a class="jxr_linenumber" name="695" href="#695">695</a>     {
<a class="jxr_linenumber" name="696" href="#696">696</a>         <strong class="jxr_keyword">if</strong> (key == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="697" href="#697">697</a>         {
<a class="jxr_linenumber" name="698" href="#698">698</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Key must not be null!"</span>);
<a class="jxr_linenumber" name="699" href="#699">699</a>         }
<a class="jxr_linenumber" name="700" href="#700">700</a> 
<a class="jxr_linenumber" name="701" href="#701">701</a>         List&lt;ConfigurationNode&gt; nodes = fetchNodeList(key);
<a class="jxr_linenumber" name="702" href="#702">702</a>         <strong class="jxr_keyword">if</strong> (nodes.isEmpty())
<a class="jxr_linenumber" name="703" href="#703">703</a>         {
<a class="jxr_linenumber" name="704" href="#704">704</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="705" href="#705">705</a>         }
<a class="jxr_linenumber" name="706" href="#706">706</a> 
<a class="jxr_linenumber" name="707" href="#707">707</a>         Iterator&lt;ConfigurationNode&gt; it = nodes.iterator();
<a class="jxr_linenumber" name="708" href="#708">708</a>         <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> source = findSourceConfiguration(it.next());
<a class="jxr_linenumber" name="709" href="#709">709</a>         <strong class="jxr_keyword">while</strong> (it.hasNext())
<a class="jxr_linenumber" name="710" href="#710">710</a>         {
<a class="jxr_linenumber" name="711" href="#711">711</a>             <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> src = findSourceConfiguration(it.next());
<a class="jxr_linenumber" name="712" href="#712">712</a>             <strong class="jxr_keyword">if</strong> (src != source)
<a class="jxr_linenumber" name="713" href="#713">713</a>             {
<a class="jxr_linenumber" name="714" href="#714">714</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"The key "</span> + key
<a class="jxr_linenumber" name="715" href="#715">715</a>                         + <span class="jxr_string">" is defined by multiple sources!"</span>);
<a class="jxr_linenumber" name="716" href="#716">716</a>             }
<a class="jxr_linenumber" name="717" href="#717">717</a>         }
<a class="jxr_linenumber" name="718" href="#718">718</a> 
<a class="jxr_linenumber" name="719" href="#719">719</a>         <strong class="jxr_keyword">return</strong> source;
<a class="jxr_linenumber" name="720" href="#720">720</a>     }
<a class="jxr_linenumber" name="721" href="#721">721</a> 
<a class="jxr_linenumber" name="722" href="#722">722</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="723" href="#723">723</a> <em class="jxr_javadoccomment">     * Evaluates the passed in property key and returns a list with the matching</em>
<a class="jxr_linenumber" name="724" href="#724">724</a> <em class="jxr_javadoccomment">     * configuration nodes. This implementation also evaluates the</em>
<a class="jxr_linenumber" name="725" href="#725">725</a> <em class="jxr_javadoccomment">     * &lt;em&gt;force reload check&lt;/em&gt; flag. If it is set,</em>
<a class="jxr_linenumber" name="726" href="#726">726</a> <em class="jxr_javadoccomment">     * {@code performReloadCheck()} is invoked.</em>
<a class="jxr_linenumber" name="727" href="#727">727</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="728" href="#728">728</a> <em class="jxr_javadoccomment">     * @param key the property key</em>
<a class="jxr_linenumber" name="729" href="#729">729</a> <em class="jxr_javadoccomment">     * @return a list with the matching configuration nodes</em>
<a class="jxr_linenumber" name="730" href="#730">730</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="731" href="#731">731</a>     @Override
<a class="jxr_linenumber" name="732" href="#732">732</a>     <strong class="jxr_keyword">protected</strong> List&lt;ConfigurationNode&gt; fetchNodeList(String key)
<a class="jxr_linenumber" name="733" href="#733">733</a>     {
<a class="jxr_linenumber" name="734" href="#734">734</a>         <strong class="jxr_keyword">if</strong> (isForceReloadCheck())
<a class="jxr_linenumber" name="735" href="#735">735</a>         {
<a class="jxr_linenumber" name="736" href="#736">736</a>             performReloadCheck();
<a class="jxr_linenumber" name="737" href="#737">737</a>         }
<a class="jxr_linenumber" name="738" href="#738">738</a> 
<a class="jxr_linenumber" name="739" href="#739">739</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">super</strong>.fetchNodeList(key);
<a class="jxr_linenumber" name="740" href="#740">740</a>     }
<a class="jxr_linenumber" name="741" href="#741">741</a> 
<a class="jxr_linenumber" name="742" href="#742">742</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="743" href="#743">743</a> <em class="jxr_javadoccomment">     * Triggers the contained configurations to perform a reload check if</em>
<a class="jxr_linenumber" name="744" href="#744">744</a> <em class="jxr_javadoccomment">     * necessary. This method is called when a property of this combined</em>
<a class="jxr_linenumber" name="745" href="#745">745</a> <em class="jxr_javadoccomment">     * configuration is accessed and the {@code forceReloadCheck} property</em>
<a class="jxr_linenumber" name="746" href="#746">746</a> <em class="jxr_javadoccomment">     * is set to &lt;b&gt;true&lt;/b&gt;.</em>
<a class="jxr_linenumber" name="747" href="#747">747</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="748" href="#748">748</a> <em class="jxr_javadoccomment">     * @see #setForceReloadCheck(boolean)</em>
<a class="jxr_linenumber" name="749" href="#749">749</a> <em class="jxr_javadoccomment">     * @since 1.6</em>
<a class="jxr_linenumber" name="750" href="#750">750</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="751" href="#751">751</a>     <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">void</strong> performReloadCheck()
<a class="jxr_linenumber" name="752" href="#752">752</a>     {
<a class="jxr_linenumber" name="753" href="#753">753</a>         <strong class="jxr_keyword">for</strong> (ConfigData cd : configurations)
<a class="jxr_linenumber" name="754" href="#754">754</a>         {
<a class="jxr_linenumber" name="755" href="#755">755</a>             <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="756" href="#756">756</a>             {
<a class="jxr_linenumber" name="757" href="#757">757</a>                 <em class="jxr_comment">// simply retrieve a property; this is enough for</em>
<a class="jxr_linenumber" name="758" href="#758">758</a>                 <em class="jxr_comment">// triggering a reload</em>
<a class="jxr_linenumber" name="759" href="#759">759</a>                 cd.getConfiguration().getProperty(PROP_RELOAD_CHECK);
<a class="jxr_linenumber" name="760" href="#760">760</a>             }
<a class="jxr_linenumber" name="761" href="#761">761</a>             <strong class="jxr_keyword">catch</strong> (Exception ex)
<a class="jxr_linenumber" name="762" href="#762">762</a>             {
<a class="jxr_linenumber" name="763" href="#763">763</a>                 <strong class="jxr_keyword">if</strong> (!ignoreReloadExceptions)
<a class="jxr_linenumber" name="764" href="#764">764</a>                 {
<a class="jxr_linenumber" name="765" href="#765">765</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/ConfigurationRuntimeException.html">ConfigurationRuntimeException</a>(ex);
<a class="jxr_linenumber" name="766" href="#766">766</a>                 }
<a class="jxr_linenumber" name="767" href="#767">767</a>             }
<a class="jxr_linenumber" name="768" href="#768">768</a>         }
<a class="jxr_linenumber" name="769" href="#769">769</a>     }
<a class="jxr_linenumber" name="770" href="#770">770</a> 
<a class="jxr_linenumber" name="771" href="#771">771</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="772" href="#772">772</a> <em class="jxr_javadoccomment">     * Creates the root node of this combined configuration.</em>
<a class="jxr_linenumber" name="773" href="#773">773</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="774" href="#774">774</a> <em class="jxr_javadoccomment">     * @return the combined root node</em>
<a class="jxr_linenumber" name="775" href="#775">775</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="776" href="#776">776</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> constructCombinedNode()
<a class="jxr_linenumber" name="777" href="#777">777</a>     {
<a class="jxr_linenumber" name="778" href="#778">778</a>         <strong class="jxr_keyword">if</strong> (getNumberOfConfigurations() &lt; 1)
<a class="jxr_linenumber" name="779" href="#779">779</a>         {
<a class="jxr_linenumber" name="780" href="#780">780</a>             <strong class="jxr_keyword">if</strong> (getLogger().isDebugEnabled())
<a class="jxr_linenumber" name="781" href="#781">781</a>             {
<a class="jxr_linenumber" name="782" href="#782">782</a>                 getLogger().debug(<span class="jxr_string">"No configurations defined for "</span> + <strong class="jxr_keyword">this</strong>);
<a class="jxr_linenumber" name="783" href="#783">783</a>             }
<a class="jxr_linenumber" name="784" href="#784">784</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/ViewNode.html">ViewNode</a>();
<a class="jxr_linenumber" name="785" href="#785">785</a>         }
<a class="jxr_linenumber" name="786" href="#786">786</a> 
<a class="jxr_linenumber" name="787" href="#787">787</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="788" href="#788">788</a>         {
<a class="jxr_linenumber" name="789" href="#789">789</a>             Iterator&lt;ConfigData&gt; it = configurations.iterator();
<a class="jxr_linenumber" name="790" href="#790">790</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node = it.next().getTransformedRoot();
<a class="jxr_linenumber" name="791" href="#791">791</a>             <strong class="jxr_keyword">while</strong> (it.hasNext())
<a class="jxr_linenumber" name="792" href="#792">792</a>             {
<a class="jxr_linenumber" name="793" href="#793">793</a>                 node = getNodeCombiner().combine(node,
<a class="jxr_linenumber" name="794" href="#794">794</a>                         it.next().getTransformedRoot());
<a class="jxr_linenumber" name="795" href="#795">795</a>             }
<a class="jxr_linenumber" name="796" href="#796">796</a>             <strong class="jxr_keyword">if</strong> (getLogger().isDebugEnabled())
<a class="jxr_linenumber" name="797" href="#797">797</a>             {
<a class="jxr_linenumber" name="798" href="#798">798</a>                 ByteArrayOutputStream os = <strong class="jxr_keyword">new</strong> ByteArrayOutputStream();
<a class="jxr_linenumber" name="799" href="#799">799</a>                 PrintStream stream = <strong class="jxr_keyword">new</strong> PrintStream(os);
<a class="jxr_linenumber" name="800" href="#800">800</a>                 TreeUtils.printTree(stream, node);
<a class="jxr_linenumber" name="801" href="#801">801</a>                 getLogger().debug(os.toString());
<a class="jxr_linenumber" name="802" href="#802">802</a>             }
<a class="jxr_linenumber" name="803" href="#803">803</a>             <strong class="jxr_keyword">return</strong> node;
<a class="jxr_linenumber" name="804" href="#804">804</a>         }
<a class="jxr_linenumber" name="805" href="#805">805</a>     }
<a class="jxr_linenumber" name="806" href="#806">806</a> 
<a class="jxr_linenumber" name="807" href="#807">807</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="808" href="#808">808</a> <em class="jxr_javadoccomment">     * Determines the configuration that owns the specified node.</em>
<a class="jxr_linenumber" name="809" href="#809">809</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="810" href="#810">810</a> <em class="jxr_javadoccomment">     * @param node the node</em>
<a class="jxr_linenumber" name="811" href="#811">811</a> <em class="jxr_javadoccomment">     * @return the owning configuration</em>
<a class="jxr_linenumber" name="812" href="#812">812</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="813" href="#813">813</a>     <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/Configuration.html">Configuration</a> findSourceConfiguration(<a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> node)
<a class="jxr_linenumber" name="814" href="#814">814</a>     {
<a class="jxr_linenumber" name="815" href="#815">815</a>         <strong class="jxr_keyword">synchronized</strong> (getReloadLock())
<a class="jxr_linenumber" name="816" href="#816">816</a>         {
<a class="jxr_linenumber" name="817" href="#817">817</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> root = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="818" href="#818">818</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> current = node;
<a class="jxr_linenumber" name="819" href="#819">819</a> 
<a class="jxr_linenumber" name="820" href="#820">820</a>             <em class="jxr_comment">// find the root node in this hierarchy</em>
<a class="jxr_linenumber" name="821" href="#821">821</a>             <strong class="jxr_keyword">while</strong> (current != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="822" href="#822">822</a>             {
<a class="jxr_linenumber" name="823" href="#823">823</a>                 root = current;
<a class="jxr_linenumber" name="824" href="#824">824</a>                 current = current.getParentNode();
<a class="jxr_linenumber" name="825" href="#825">825</a>             }
<a class="jxr_linenumber" name="826" href="#826">826</a> 
<a class="jxr_linenumber" name="827" href="#827">827</a>             <em class="jxr_comment">// Check with the root nodes of the child configurations</em>
<a class="jxr_linenumber" name="828" href="#828">828</a>             <strong class="jxr_keyword">for</strong> (ConfigData cd : configurations)
<a class="jxr_linenumber" name="829" href="#829">829</a>             {
<a class="jxr_linenumber" name="830" href="#830">830</a>                 <strong class="jxr_keyword">if</strong> (root == cd.getRootNode())
<a class="jxr_linenumber" name="831" href="#831">831</a>                 {
<a class="jxr_linenumber" name="832" href="#832">832</a>                     <strong class="jxr_keyword">return</strong> cd.getConfiguration();
<a class="jxr_linenumber" name="833" href="#833">833</a>                 }
<a class="jxr_linenumber" name="834" href="#834">834</a>             }
<a class="jxr_linenumber" name="835" href="#835">835</a>         }
<a class="jxr_linenumber" name="836" href="#836">836</a> 
<a class="jxr_linenumber" name="837" href="#837">837</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">this</strong>;
<a class="jxr_linenumber" name="838" href="#838">838</a>     }
<a class="jxr_linenumber" name="839" href="#839">839</a> 
<a class="jxr_linenumber" name="840" href="#840">840</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="841" href="#841">841</a> <em class="jxr_javadoccomment">     * An internal helper class for storing information about contained</em>
<a class="jxr_linenumber" name="842" href="#842">842</a> <em class="jxr_javadoccomment">     * configurations.</em>
<a class="jxr_linenumber" name="843" href="#843">843</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="844" href="#844">844</a>     <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/commons/configuration/DynamicCombinedConfiguration.html">ConfigData</a>
<a class="jxr_linenumber" name="845" href="#845">845</a>     {
<a class="jxr_linenumber" name="846" href="#846">846</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores a reference to the configuration. */</em>
<a class="jxr_linenumber" name="847" href="#847">847</a>         <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> configuration;
<a class="jxr_linenumber" name="848" href="#848">848</a> 
<a class="jxr_linenumber" name="849" href="#849">849</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the name under which the configuration is stored. */</em>
<a class="jxr_linenumber" name="850" href="#850">850</a>         <strong class="jxr_keyword">private</strong> String name;
<a class="jxr_linenumber" name="851" href="#851">851</a> 
<a class="jxr_linenumber" name="852" href="#852">852</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the at information as path of nodes. */</em>
<a class="jxr_linenumber" name="853" href="#853">853</a>         <strong class="jxr_keyword">private</strong> Collection&lt;String&gt; atPath;
<a class="jxr_linenumber" name="854" href="#854">854</a> 
<a class="jxr_linenumber" name="855" href="#855">855</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the at string.*/</em>
<a class="jxr_linenumber" name="856" href="#856">856</a>         <strong class="jxr_keyword">private</strong> String at;
<a class="jxr_linenumber" name="857" href="#857">857</a> 
<a class="jxr_linenumber" name="858" href="#858">858</a>         <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> Stores the root node for this child configuration.*/</em>
<a class="jxr_linenumber" name="859" href="#859">859</a>         <strong class="jxr_keyword">private</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> rootNode;
<a class="jxr_linenumber" name="860" href="#860">860</a> 
<a class="jxr_linenumber" name="861" href="#861">861</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="862" href="#862">862</a> <em class="jxr_javadoccomment">         * Creates a new instance of {@code ConfigData} and initializes</em>
<a class="jxr_linenumber" name="863" href="#863">863</a> <em class="jxr_javadoccomment">         * it.</em>
<a class="jxr_linenumber" name="864" href="#864">864</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="865" href="#865">865</a> <em class="jxr_javadoccomment">         * @param config the configuration</em>
<a class="jxr_linenumber" name="866" href="#866">866</a> <em class="jxr_javadoccomment">         * @param n the name</em>
<a class="jxr_linenumber" name="867" href="#867">867</a> <em class="jxr_javadoccomment">         * @param at the at position</em>
<a class="jxr_linenumber" name="868" href="#868">868</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="869" href="#869">869</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/DynamicCombinedConfiguration.html">ConfigData</a>(<a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> config, String n, String at)
<a class="jxr_linenumber" name="870" href="#870">870</a>         {
<a class="jxr_linenumber" name="871" href="#871">871</a>             configuration = config;
<a class="jxr_linenumber" name="872" href="#872">872</a>             name = n;
<a class="jxr_linenumber" name="873" href="#873">873</a>             atPath = parseAt(at);
<a class="jxr_linenumber" name="874" href="#874">874</a>             <strong class="jxr_keyword">this</strong>.at = at;
<a class="jxr_linenumber" name="875" href="#875">875</a>         }
<a class="jxr_linenumber" name="876" href="#876">876</a> 
<a class="jxr_linenumber" name="877" href="#877">877</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="878" href="#878">878</a> <em class="jxr_javadoccomment">         * Returns the stored configuration.</em>
<a class="jxr_linenumber" name="879" href="#879">879</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="880" href="#880">880</a> <em class="jxr_javadoccomment">         * @return the configuration</em>
<a class="jxr_linenumber" name="881" href="#881">881</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="882" href="#882">882</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/AbstractConfiguration.html">AbstractConfiguration</a> getConfiguration()
<a class="jxr_linenumber" name="883" href="#883">883</a>         {
<a class="jxr_linenumber" name="884" href="#884">884</a>             <strong class="jxr_keyword">return</strong> configuration;
<a class="jxr_linenumber" name="885" href="#885">885</a>         }
<a class="jxr_linenumber" name="886" href="#886">886</a> 
<a class="jxr_linenumber" name="887" href="#887">887</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="888" href="#888">888</a> <em class="jxr_javadoccomment">         * Returns the configuration's name.</em>
<a class="jxr_linenumber" name="889" href="#889">889</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="890" href="#890">890</a> <em class="jxr_javadoccomment">         * @return the name</em>
<a class="jxr_linenumber" name="891" href="#891">891</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="892" href="#892">892</a>         <strong class="jxr_keyword">public</strong> String getName()
<a class="jxr_linenumber" name="893" href="#893">893</a>         {
<a class="jxr_linenumber" name="894" href="#894">894</a>             <strong class="jxr_keyword">return</strong> name;
<a class="jxr_linenumber" name="895" href="#895">895</a>         }
<a class="jxr_linenumber" name="896" href="#896">896</a> 
<a class="jxr_linenumber" name="897" href="#897">897</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="898" href="#898">898</a> <em class="jxr_javadoccomment">         * Returns the at position of this configuration.</em>
<a class="jxr_linenumber" name="899" href="#899">899</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="900" href="#900">900</a> <em class="jxr_javadoccomment">         * @return the at position</em>
<a class="jxr_linenumber" name="901" href="#901">901</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="902" href="#902">902</a>         <strong class="jxr_keyword">public</strong> String getAt()
<a class="jxr_linenumber" name="903" href="#903">903</a>         {
<a class="jxr_linenumber" name="904" href="#904">904</a>             <strong class="jxr_keyword">return</strong> at;
<a class="jxr_linenumber" name="905" href="#905">905</a>         }
<a class="jxr_linenumber" name="906" href="#906">906</a> 
<a class="jxr_linenumber" name="907" href="#907">907</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="908" href="#908">908</a> <em class="jxr_javadoccomment">         * Returns the root node for this child configuration.</em>
<a class="jxr_linenumber" name="909" href="#909">909</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="910" href="#910">910</a> <em class="jxr_javadoccomment">         * @return the root node of this child configuration</em>
<a class="jxr_linenumber" name="911" href="#911">911</a> <em class="jxr_javadoccomment">         * @since 1.5</em>
<a class="jxr_linenumber" name="912" href="#912">912</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="913" href="#913">913</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> getRootNode()
<a class="jxr_linenumber" name="914" href="#914">914</a>         {
<a class="jxr_linenumber" name="915" href="#915">915</a>             <strong class="jxr_keyword">return</strong> rootNode;
<a class="jxr_linenumber" name="916" href="#916">916</a>         }
<a class="jxr_linenumber" name="917" href="#917">917</a> 
<a class="jxr_linenumber" name="918" href="#918">918</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="919" href="#919">919</a> <em class="jxr_javadoccomment">         * Returns the transformed root node of the stored configuration. The</em>
<a class="jxr_linenumber" name="920" href="#920">920</a> <em class="jxr_javadoccomment">         * term &amp;quot;transformed&amp;quot; means that an eventually defined at path</em>
<a class="jxr_linenumber" name="921" href="#921">921</a> <em class="jxr_javadoccomment">         * has been applied.</em>
<a class="jxr_linenumber" name="922" href="#922">922</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="923" href="#923">923</a> <em class="jxr_javadoccomment">         * @return the transformed root node</em>
<a class="jxr_linenumber" name="924" href="#924">924</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="925" href="#925">925</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> getTransformedRoot()
<a class="jxr_linenumber" name="926" href="#926">926</a>         {
<a class="jxr_linenumber" name="927" href="#927">927</a>             <a href="../../../../org/apache/commons/configuration/tree/ViewNode.html">ViewNode</a> result = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/ViewNode.html">ViewNode</a>();
<a class="jxr_linenumber" name="928" href="#928">928</a>             <a href="../../../../org/apache/commons/configuration/tree/ViewNode.html">ViewNode</a> atParent = result;
<a class="jxr_linenumber" name="929" href="#929">929</a> 
<a class="jxr_linenumber" name="930" href="#930">930</a>             <strong class="jxr_keyword">if</strong> (atPath != <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="931" href="#931">931</a>             {
<a class="jxr_linenumber" name="932" href="#932">932</a>                 <em class="jxr_comment">// Build the complete path</em>
<a class="jxr_linenumber" name="933" href="#933">933</a>                 <strong class="jxr_keyword">for</strong> (String p : atPath)
<a class="jxr_linenumber" name="934" href="#934">934</a>                 {
<a class="jxr_linenumber" name="935" href="#935">935</a>                     <a href="../../../../org/apache/commons/configuration/tree/ViewNode.html">ViewNode</a> node = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/ViewNode.html">ViewNode</a>();
<a class="jxr_linenumber" name="936" href="#936">936</a>                     node.setName(p);
<a class="jxr_linenumber" name="937" href="#937">937</a>                     atParent.addChild(node);
<a class="jxr_linenumber" name="938" href="#938">938</a>                     atParent = node;
<a class="jxr_linenumber" name="939" href="#939">939</a>                 }
<a class="jxr_linenumber" name="940" href="#940">940</a>             }
<a class="jxr_linenumber" name="941" href="#941">941</a> 
<a class="jxr_linenumber" name="942" href="#942">942</a>             <em class="jxr_comment">// Copy data of the root node to the new path</em>
<a class="jxr_linenumber" name="943" href="#943">943</a>             <a href="../../../../org/apache/commons/configuration/tree/ConfigurationNode.html">ConfigurationNode</a> root = <a href="../../../../org/apache/commons/configuration/ConfigurationUtils.html">ConfigurationUtils</a>
<a class="jxr_linenumber" name="944" href="#944">944</a>                     .convertToHierarchical(getConfiguration(),
<a class="jxr_linenumber" name="945" href="#945">945</a>                             getConversionExpressionEngine()).getRootNode();
<a class="jxr_linenumber" name="946" href="#946">946</a>             atParent.appendChildren(root);
<a class="jxr_linenumber" name="947" href="#947">947</a>             atParent.appendAttributes(root);
<a class="jxr_linenumber" name="948" href="#948">948</a>             rootNode = root;
<a class="jxr_linenumber" name="949" href="#949">949</a> 
<a class="jxr_linenumber" name="950" href="#950">950</a>             <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="951" href="#951">951</a>         }
<a class="jxr_linenumber" name="952" href="#952">952</a> 
<a class="jxr_linenumber" name="953" href="#953">953</a>         <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="954" href="#954">954</a> <em class="jxr_javadoccomment">         * Splits the at path into its components.</em>
<a class="jxr_linenumber" name="955" href="#955">955</a> <em class="jxr_javadoccomment">         *</em>
<a class="jxr_linenumber" name="956" href="#956">956</a> <em class="jxr_javadoccomment">         * @param at the at string</em>
<a class="jxr_linenumber" name="957" href="#957">957</a> <em class="jxr_javadoccomment">         * @return a collection with the names of the single components</em>
<a class="jxr_linenumber" name="958" href="#958">958</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="959" href="#959">959</a>         <strong class="jxr_keyword">private</strong> Collection&lt;String&gt; parseAt(String at)
<a class="jxr_linenumber" name="960" href="#960">960</a>         {
<a class="jxr_linenumber" name="961" href="#961">961</a>             <strong class="jxr_keyword">if</strong> (at == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="962" href="#962">962</a>             {
<a class="jxr_linenumber" name="963" href="#963">963</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="964" href="#964">964</a>             }
<a class="jxr_linenumber" name="965" href="#965">965</a> 
<a class="jxr_linenumber" name="966" href="#966">966</a>             Collection&lt;String&gt; result = <strong class="jxr_keyword">new</strong> ArrayList&lt;String&gt;();
<a class="jxr_linenumber" name="967" href="#967">967</a>             DefaultConfigurationKey.KeyIterator it = <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/configuration/tree/DefaultConfigurationKey.html">DefaultConfigurationKey</a>(
<a class="jxr_linenumber" name="968" href="#968">968</a>                     AT_ENGINE, at).iterator();
<a class="jxr_linenumber" name="969" href="#969">969</a>             <strong class="jxr_keyword">while</strong> (it.hasNext())
<a class="jxr_linenumber" name="970" href="#970">970</a>             {
<a class="jxr_linenumber" name="971" href="#971">971</a>                 result.add(it.nextKey());
<a class="jxr_linenumber" name="972" href="#972">972</a>             }
<a class="jxr_linenumber" name="973" href="#973">973</a>             <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="974" href="#974">974</a>         }
<a class="jxr_linenumber" name="975" href="#975">975</a>     }
<a class="jxr_linenumber" name="976" href="#976">976</a> }
</pre>
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